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Current detection system of distributed high-voltage power transmission line

A high-voltage transmission line and current detection technology, applied in the direction of voltage/current isolation, current only measurement, current/voltage measurement, etc., can solve the problems of time-consuming and labor-consuming, cumbersome operation, large volume, etc., and achieve the goal of reducing time and manpower Consumption, simple operation, magnetic field sensitive effect

Pending Publication Date: 2020-10-09
贵州江源电力建设有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it is larger in size, higher in price, and needs the support of external power supply, etc.
[0006] Hall current sensor, Hall current sensor is a commonly used current measuring device, it uses Hall elements as the sensing unit, and realizes the measurement of current through the magnitude of the magnetic field generated by the measured current, which is applied to the measurement of large flow , but the device has the disadvantages of large size and heavy weight
[0007] To sum up, the current detection methods in the prior art all have the disadvantages of large volume, heavy weight, and being easily disturbed by the excitation current.
Moreover, the current detection method in the prior art is usually aimed at detecting one transmission wire. When the entire power transmission system contains multiple transmission wires, each transmission wire needs to be detected separately, which is cumbersome and time-consuming. force

Method used

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  • Current detection system of distributed high-voltage power transmission line
  • Current detection system of distributed high-voltage power transmission line
  • Current detection system of distributed high-voltage power transmission line

Examples

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Embodiment 1

[0048] Such as figure 1 , figure 2 As shown, the present embodiment provides a current detection system for a distributed high-voltage transmission line, including: a broadband light source, a wave splitter, a plurality of Faraday current sensors having the same number as a plurality of wires to be tested, at least one detector, and a solution A tuner and a data analysis display terminal, wherein each of the Faraday current sensors is respectively arranged on each wire to be tested, and is used for simultaneously measuring multiple wires to be tested.

[0049] One of the biggest advantages of the present invention is that it is suitable for simultaneous detection of multiple wires to be tested, the detection light is emitted by the same light source, and finally displayed by the same data analysis display terminal, and the detection personnel can do it at one time. Obtaining the current conditions of all transmission wires has the advantages of simple operation and reduced t...

Embodiment 2

[0086] This embodiment provides a specific embodiment of calculating the current intensity after measuring the wire to be tested by the current detection system of the distributed high-voltage transmission line of the present invention, as follows:

[0087] Use 65-wt% ytterbium-doped silicate fiber as Faraday fiber, length d=0.01m, Verder constant is V=32rad / (T m), known from Faraday magneto-optical effect, in known length d and Verder constant V In the case of deflection angle θ F The relationship between and the magnetic field strength B is:

[0088] θ F =VBd=32rad / (T.m)·0.01m·B=0.32B(rad)

[0089] The unit of the magnetic field strength B is Tesla (T). And it can be seen that the magnetic field strength B and the deflection angle θ F proportional to:

[0090] B=3.12θ F

[0091] Among them, the deflection angle θ F According to the reference light intensity I 0 and the light intensity I produced by the Faraday waveguide or optical fiber with a polarizer subjected to...

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Abstract

The invention relates to the technical field of current detection in a high-voltage power transmission line, and provides a current detection system of a distributed high-voltage power transmission line. The system comprises a broadband light source, a wave separator, Faraday current sensors with the same number as a plurality of to-be-measured wires, a detector and a demodulator; the broadband light source emits detection light, and a plurality of detection lights with different wavelengths are formed through the wave separator and transmitted to the Faraday current sensors arranged on the plurality of to-be-measured wires; optical signals are converted into electric signals, the electric signals are input into the demodulator, a magnetic field intensity B is obtained through calculationaccording to the Faraday magneto-optical effect and the Malus theorem, and the current intensity I of the multiple to-be-measured wires is calculated according to the Pitot-Savart theorem and the magnetic field intensity B. The problems that a power transmission line current detection method is large in size, heavy in weight and prone to being interfered by exciting current, a measurement system is complex in structure, and when a power transmission system comprises a plurality of power transmission wires, each power transmission wire needs to be detected respectively are solved.

Description

technical field [0001] The invention relates to the technical field of current detection in high-voltage transmission lines, in particular to a current detection system for distributed high-voltage transmission lines, which uses optical fiber sensing technology and signal processing technology to quickly detect the current in the wire, and is suitable for real-time monitoring of current in high-voltage transmission lines Detection, especially suitable for simultaneous detection of power transmission systems with multiple transmission lines at the same time. Background technique [0002] Current detection methods commonly used in the prior art include the following methods: [0003] Shunt: The principle of the shunt is simple, and it is usually used in low-frequency and small-amplitude current measurement, but when it is applied to high-frequency and large-value current measurement, a large error will occur. [0004] AC current transformer: AC current transformer has a simpl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/24
CPCG01R19/0092G01R15/246
Inventor 周齐姜淳华卫蒋朝开黎红鄔豪史显河张朋
Owner 贵州江源电力建设有限公司
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